Methylene bridge

A methylene bridge is kind of like a little bridge made out of carbon and hydrogen atoms. Imagine building a little bridge out of Lego blocks, but instead of normal-sized Legos, you use really tiny ones. Each atom in the bridge is a tiny Lego block, and all of these blocks are connected in a straight line like a chain.

This methylene bridge can be used to connect two larger molecules together. It's kind of like a connector piece that you use to link two other pieces together. The bridge is very strong and stable, so it can hold the two molecules together firmly.

Scientists use methylene bridges a lot in chemistry and biology to make new compounds and materials. They can change the size or shape of the bridge to tweak the properties of the final product. But no matter what, the bridge always stays strong and reliable, just like a good Lego bridge.